package com.suxin.design.facade;

/**
 * @author Tang
 * @classname Screen
 * @description [  ]
 * @date 2022/12/30 15:34
 */
public class Screen {

    private static final Screen instance = new Screen();

    public static Screen getInstance() {
        return instance;
    }

    public void up() {
        System.out.println(" Screen up ");
    }

    public void down() {
        System.out.println(" Screen down ");
    }

}
